Merge pull request #8491 from reitermarkus/document-spdx

Document `SPDX`.

Library/Homebrew/.rubocop_todo.yml

@@ -25,6 +25,5 @@ Style/Documentation:
     - 'utils/pypi.rb'
     - 'utils/shebang.rb'
     - 'utils/shell.rb'
-    - 'utils/spdx.rb'
     - 'utils/livecheck_formula.rb'
     - 'version.rb'

Library/Homebrew/utils/spdx.rb

@@ -2,6 +2,9 @@
 
 require "utils/github"
 
+# Helper module for updating SPDX license data.
+#
+# @api private
 module SPDX
   module_function